The document summarizes the instructions and specifications for a tens unit device. It provides details on controls and features, directions for use in different modes, user parameters that can be adjusted, electrode placement and skin care, battery information, safety information including indications, contraindications and warnings. It also lists the accessories included, warranty period and physical specifications of the device.

1. Page 1
Tens Unit

2. Page 2
Table of Contents:
Customer Service / Supplies / Support
Pg
3
Get Started with the TruWave
Pg
4
Controls and Features
Pg
4
Directions for Use
Pg
5
Factory Settings
Pg
6
User Parameters
Pg
7
Electrodes and Skin Care
Pg 10
Batteries
Pg 11
Indications
Pg 11
Contraindications
Pg 11
Safety
Pg 11
Precautions
Pg 12
Warnings
Pg 12
Specifications
Pg 13
Caution:
Federal Law restricts this device to sale by or on the order of a practitioner licensed by the law of the State in which he/she practices to use or
order the use of the device.

3. Page 3
Zynex Medical
Painezee
Contact Information
0091-9030022402
(866) 940-7030
CUSTOMER SERVICE
Supplies:
To order more electrodes or other accessories
Technical Support:
Questions or problems with using your device
Device Return:
Order a postage paid return envelope to return your
device at no charge
(800) 495-6670
0091-9030022402
MAIN OFFICE
Billing Questions:
Questions regarding insurance benefits and
covered benefits for durable medical equipment or
questions about an Explanation of Benefits form
you received in the mail
FAX NUMBER
(800) 495-6695
MAILING ADDRESS
Zynex Medical
Plot No: 6, Green Avenues,
9990 Park Meadows Drive Nizampet Road,
Opp:Bhavyas Anandham,
Lone Tree, CO 80124ad - 500090
Kukatpally, Hydera
b
Andhra Pradesh, India
EMAIL
info@painezee.com
WEBSITE
zynexmed.com
www.painezee.com
info@zynexmed.com

4. Page 4
Get Started with the TruWave
Make sure the electrodes are placed properly on the skin (see “Electrodes and
skin care” for details) and that the lead wires are properly connected.
Turn on the unit by pressing ON for more than 1 second. The right LED will
illuminate, indicating that the leads and electrodes are properly connected and
that the unit functions properly.
Keep pressing ↑ on either channel until a comfortable level is reached, as
indicated by your physician or therapist.
To stop treatment, keep pressing ↓ on the channel used until display and light
goes out after 1 additional second (mA will go to zero first). Thereafter remove the electrodes and place them on the plastic pad.
Stimulation will run continuously until the treatment timer is changed or the
unit is turned off.
Controls and features.
The arrows on each side of the device will control only the intensity, unless
the Program button is pressed and the display will indicate which parameter is
being programmed.
These same arrows on the right side also serve as On or Off buttons. To turn
the device On, press the Arrow-button marked “On” for more than one second. To turn off the device, press the Arrow-button marked Off for more than
three seconds and it will turn off.
Programming is done as described below by pressing the middle button,
“Program”, which is used to scroll through a number of options.

5. Page 5
Directions for Use.
Turn unit ON and OFF: Press ON for 1 second to turn the unit on. The display will light up and the right LED will illuminate. Keep pressing OFF to
turn the unit off. It takes one additional second after reaching 0 mA to turn it
off. If no controls have been touched for five minutes with level at 0 mA or
five minutes after timeout, the TruWave will automatically turn off.
Setting Stimulation Level: Use ↑ and ↓ controls to increase or decrease level.
Do not use the PRG button. After 20 seconds the stimulation level is electronically locked as a safety feature to prevent the patient from unintentional
increase in stimulation. To increase, just press ↓ to reduce it by at least 1 mA,
which will unlock the safety feature. Thereafter you have 20 seconds to increase to desired level, before the lock is activated again. Any change in level
or mode will unlock the level.
Setting Mode: Press PRG once and use ↑ or ↓ to scroll between Normal,
Burst, Modulated and Strength Duration (SD) Modes.
Setting the Treatment Time: Press PRG four times and use ↑ or ↓ to select
the desired Treatment Time. Keep pressing ↑ to set a Continuous Treatment
Time.
Setting Frequency: Press PRG twice and use ↑ or ↓ to increase or decrease
the frequency of the Normal, Burst or Modulated modes. In SD mode the frequency is always fixed at 100 Hz, so this is not programmable.
SettingPulse Width: Press PRG three times and use ↑ or ↓ to increase or decrease the pulse width in Normal, Burst, or Modulated modes. In SD mode
the pulse width is fixed at 225 µsec.
Compliance data: Press PRG five times and use ↓ to display the usage time
in minutes and number of times used, when prompted by text in display. Only
stimulation levels above 5 mA are recorded as usage time. The compliance
meter can be reset by pressing ↑ to show prompt in display and thereafter
press ↓ twice to reset both parameters to zero.

6. Page 6
Return to factory settings: Press PRG six times and display will
prompt the choice to reset all parameters to factory settings. This is
particularly useful if the user is unsure if the settings are correct and is
a good starting point for variations.
Factory settings are:
Normal
Frequency
Pulse Width
Burst
Modulated
70 Hz
2 Hz
66-100 Hz
100 Hz
200 µsec.
200 µsec.
200 µsec.
200 µsec.
50%
Span
6 sec.
Cycle Time
Treatment Timer
Strength Duration
60 min
60 min
6 sec.
60 min
60 min

7. Page 7
User Parameters:
Normal Mode:
The default frequency is 70Hz, but as described in the section “Directions
for Use” can be set with intervals of 5Hz between 21Hz and 160 Hz and with
intervals of 1Hz between 2 and 20 Hz. The stimulation frequency is an indication of how often each stimulation pulse occurs, i.e. 70Hz means 70 stimulation pulses per second.
The default Pulse Width is 300 µsec, but as described in the section
“Directions for Use” can be set with intervals of 5µsec. between 50 and 400
µsec. The stimulation Pulse Width is an indication of how long the stimulation lasts during each stimulation pulse, i.e an indication of the “strength” of
the stimulation. An increase of Pulse Width will therefore be felt similar to
an increase in intensity.
The treatment timer is set default to 20 minutes, but as described in the section “Directions for Use” can be set with intervals of 10 minutes between
Continuous and up to 90 minutes. The treatment timer will count down as
shown in the display and stimulation will drop to zero after time is out. The
user can commence a new treatment session by increasing the level as desired.
The User can program the following parameters: Frequency, Pulse Width
and Treatment Time.

8. Page 8
Burst Mode:
The default frequency is 2 Hz, but as described in the section “Directions for
Use” can be set with intervals of 0.5 Hz between 0.5 Hz and 4 Hz. The Burst
Frequency is an indication of how often each train of pulses (eight pulses)
occurs. Each of the eight pulses in the pulse train consists of 50-400µsec
wide pulses each 10 millisecond (100 Hz). Burst stimulation is best applied
when the intensity is set to a level where visible, yet comfortable contractions at the rate of the burst frequency are present. The effect is usually felt
after 15 minutes or more of burst stimulation.
The treatment timer is set default to 20 minutes, but as described in the section “Directions for Use” can be set with intervals of 10 minutes between
Continuous, 10 minutes and up to 90 minutes. The treatment timer will count
down as shown in the display and stimulation will drop to zero after time is
out. The user can commence a new treatment session by increasing the level
as desired.
The User can program the following parameters: Burst Frequency, Pulse
Width and Treatment Time.
Modulated Mode:
The frequency will shift (modulate) between 66 and 100 Hz with a preset
interval of 6 seconds between each end frequency. The Pulse Width will also
shift (modulate) during the 6 seconds interval from 50µsec. to 400 µsec.
around the set Pulse Width. The Cycle Rate can be programmed between 5
and 12 seconds, but is preset at 6 seconds at default. The default Pulse Width
is 225µsec. and when the frequency is at it’s minimum, the Pulse Width is at
it’s maximum and visa versa.
The treatment timer is set default to 20 minutes, but as described in the section “Directions for Use” can be set with intervals of 10 minutes between
Continuous and up to 90 minutes. The treatment timer will count down as
shown in the display and stimulation will drop to zero after time is out. The
user can commence a new treatment session by increasing the level as desired.
The User can program the following parameters: Pulse Width, Cycle Rate
and Treatment Time.

9. Page 9
SD Mode:
Strength Duration (SD). The Frequency is fixed at 100Hz in this mode.
The Pulse Width as well as the intensity will vary in opposite ways
during an interval of 6 seconds. The Span is preset to 50%, so the pulse
width decreases to 50% of the set pulse width and up to 50% above.
Simultaneously, the Intensity increases to 50% of the set value and
decreases to 50% above. The pulse width is set at 225µsec. and can not
be changed. The energy delivered through the electrodes therefore remains constant, due to the increase of the intensity while the pulse
width decreases and visa versa.
The treatment timer is set default to 20 minutes, but as described in the
section “Directions for Use” can be set with intervals of 10 minutes
between Continuous and up to 90 minutes. The treatment timer will
count down as shown in the display and stimulation will drop to zero
after time is out. The user can commence a new treatment session by
increasing the level as desired.
The User can program the following parameters: Span, Cycle Rate and
Treatment Timer.

10. Page 10
Electrodes and Skin Care
The TruWave comes with 4 self-adhesive electrodes, 2” x 2” square.
These electrodes are for multiple use, pre-wired and fit directly into the
lead wires. The lead wires attach to the connectors at the top of the device,
while the other end of the lead wires, consisting of two pins, will attach
directly to the electrodes. For each channel used there must always be two
electrodes connected and placed on the skin to complete the circuit for the
electrical current to flow.
Proper skin care will help make the use of this device more comfortable
and trouble-free. Prior to treatment, wash the areas where the electrodes
will be placed with mild soap and water, rinse and dry the skin thoroughly.
If necessary, remove excess body hair.
The TruWave is intended to be used with re-usable, self-adhesive electrodes. Extended number of uses can be obtained by adding water to the
adhesive surface immediately after each use and placing them on the plastic pad. They will regain their conductivity and adhesiveness as compared
to leaving them dry.
Sterile electrodes may be required for some post-op applications.

11. Page 11
Batteries
One 9 volt Alkaline battery is used. The battery compartment on the
back of the device opens by sliding the cover downwards. Please
ensure to dispose the used batteries properly.
Rechargeable batteries are not recommended as they only have a short
usage time and are not charged while in the device.
The display will indicate “Batt Low” when the voltage of the batteries
drops below the level for satisfactory function. A red flashing LED will
also lead the attention to replacing the battery. Please replace the
battery with a new Alkaline battery in this event.
The TruWave accommodates a 9 Volt battery even if it is
inserted with reverse polarity and the TruWave circuitry will
ensure full functionality with reverse polarity.
Indications, contraindications, precautions, safety and warnings.
Safety References
Zynex Medical (Zynex) is only responsible for the safety, reliability and
function of the device when repairs, adjustments and changes have been
carried out by persons authorized by Zynex for such work and the device is
used according to the user manual. Repairs and technical safety tests shall only
be carried out by trained personnel.
Indications
This Zynex device has been designed for pain relief and should only be used
under supervision for adjunctive therapy for the treatment of medical diseases
and conditions.
Contraindications
•
The device must not be used on patients with cardiac pacemaker.
•
The stimulation must not be applied transcerebrally.
•
The device must not be applied with undiagnosed pain syndromes until
etiology is established.
•
Electrodes should not be placed so that current will be applied to the
•
carotid sinus (neck) region or transcerebrally (through the head).

12. Page 12
Warnings
•
This device is not effective for pain of central origin (This includes headache).
•
The safety of tens devices for use during pregnancy or birth has not been established.
•
This device should only be used under the continued supervision of a physician.
•
This device does not have curative value.
•
This device offers symptomatic treatment and as such suppresses the sensation
of pain which would otherwise serve as a protective mechanism.
•
The user must keep the device out of reach of children.
•
Electronic monitoring equipment (such as ECG monitors and ECG alarms)
may not operate properly when this device is in use.
Stimulation should not be applied transthoracically in that the introduction of electrical current into the heart may cause cardiac arrhythmias.
Precautions
•
Some patients may experience skin irritation or hypersensitivity due to the
electrical stimulation or electrical conductive medium. The irritation can usually be
reduced by using an alternate conductive medium, or alternate electrode placement.
•
If the stimulation levels are uncomfortable or become uncomfortable, reduce
the stimulation amplitude to a comfortable level and contact your physician if problems persist.
Effectiveness is highly dependent upon patient selection by a person qualified in the
management of pain patients.
Adverse Reactions:
Skin irritation and burns beneath the electrodes are potential adverse reactions.

13. Page 13
Specifications.
Dimensions:
Weight:
Accessories:
Warranty:
Left channel
Output
Programming
2.5 x 5.5 x 1.0 in.
8 oz. incl. Battery.
2 lead wires, one 9 Volt battery,
carrying case, users manual and
one pack of electrodes.
3 Years
6 months manufacturers warranty on
materials and workmanship.
Accessories excluded.
Right channel
Output
Readout Display
Indicator LED’S
Left channel Up
and Down
Right channel Up
and Down

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Waveform:

15. Page 16
Plot no:6, Green Avenues, Opp: Bhavyas Anandham,
Nizampet road, Kukatpally, Hyderabad - 500090
9990 Park Meadows Drive, Lone Tree, CO 80124
1-800-495-6670
www.zynexmed.com
P/N 300220 Rev 03